linux-kernel - Re: [PATCH] cw1200: Fix concurrency use-after-free bugs in cw1200_hw

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Date:   Thu, 20 Dec 2018 06:49:56 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     pizza@...ftnet.org, davem@...emloft.net,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: Re: [PATCH] cw1200: Fix concurrency use-after-free bugs in
 cw1200_hw_scan()

Jia-Ju Bai <baijiaju1990@...il.com> wrote:

> The function cw1200_bss_info_changed() and cw1200_hw_scan() can be
> concurrently executed.
> The two functions both access a possible shared variable "frame.skb".
> 
> This shared variable is freed by dev_kfree_skb() in cw1200_upload_beacon(), 
> which is called by cw1200_bss_info_changed(). The free operation is 
> protected by a mutex lock "priv->conf_mutex" in cw1200_bss_info_changed().
> 
> In cw1200_hw_scan(), this shared variable is accessed without the
> protection of the mutex lock "priv->conf_mutex". 
> Thus, concurrency use-after-free bugs may occur.
> 
> To fix these bugs, the original calls to mutex_lock(&priv->conf_mutex) and 
> mutex_unlock(&priv->conf_mutex) are moved to the places, which can 
> protect the accesses to the shared variable.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>

Patch applied to wireless-drivers-next.git, thanks.

4f68ef64cd7f cw1200: Fix concurrency use-after-free bugs in cw1200_hw_scan()

-- 
https://patchwork.kernel.org/patch/10730469/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches